Log in to LoL and LoR with different Riot Account

I want to play League on my main account but want to have LoR open while I wait in queue. The problem is that my 'main' LoR account isnt my main League account, I ended up getting better cards on an alt account. Is it possible to log in to League on what account and have LoR open through a different account? Thanks
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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